I really love what happened recently to the game with helminth and armor rework and archon mods. Frost is in a decent spot IMO. Some additional tweaks would be welcomed for his passive, 1 and 2, but I replaced his 2 with Thermal Sunder and use his 1 as utility to shatter his globe. The full armor strip on his 4 is amazing and thermal Sunder makes him a decent caster frame, where you can actually kill enemies with abilities.
Here is my build: https://overframe.gg/build/386728/frost-prime/archon-thermal-sunder/
Energy cost isn’t a problem with high efficiency and zenurik. Don’t really need range since i usually move from pack to pack. I even put a lot of utility in my build with Mecha set and icy avalanche. I once out damage people in SP circuit with this build.